The yf SITE ORREYic0t INS & GT S. 
came again contracted. into a narrow tube, which 
reaffumed ‘once again the form of a bladder, beau- 
tifully adorned with a great number of pulmo- 
nary tubes running over the whole furface, wu a. 
Some particles of fat very regularly placed, and. 
mott curioufly contrived, furrounded one fide of 
thefe glandular vefiels, x, and underneath, ex- 
tended into a kind of blind or clofed appendages, 
yy, fach as I had never obferved before in the 
fat of any creature. . 
Nor ¢an I tell the ufe of the particles laft de- 
{cribed, though I have reafon to think they per- 
form the office of falival glands and dudts. For, 
as the Mite fpins no web, and thefe baggs are 
clofed behind, I do not think any other fervice 
can be fo properly attributed to them. 
Thé pulmonaty tubes, which are diftributed 
through all the parts we have been furveying, 
are conftructed in the Mite after the fame man- 
ner as they are in other infects. That great 
anatomift Malpighi, has given an inftance of 
this in his account of Silkworms; and I have, 
miyfelf, frequently done the like in this work. 
But the rings ‘compofing thefe tubes, are not fo 
very numerous; for which reafon, they are of a 
more membranaceous and flexible ftructure, 
The motion of thefe pulmonary tubes is feen 
very evidently through the fkin, on examining 
with a microfcope the Mite, held on the point 
of a pin run through its head; for, as the infec 
in this condition turns and twifts itfelf a great 
many ways, the pulmonary tubes affume, in con- 
fequence of its motions, a variety of appearances. 
Sometimes they are ftretched out to their length, 
at other times they are bent in a ferpentine man- 
ner, or coiled up in form of a circle; but not- 
withftanding fo many diftortions, the rings com- 
pofing them always retain their form, and never 
collapfe. Thus has the Omnipotent Archite@t 
given us the fpecimen of a tube, fo perfectly 
flexible, that the moft violent contcrtions cannot 
do it the leaft injury. 
‘The brain is fituated in the neck, near the 
horny bones, that form the rhouth and palate of 
the infect. This fituation of the brain makes 
it fall lower in the neck, on the Worm’s pull- 
ing its feet into its mouth; atid, on the contrary, 
it 1s drawn fotward,.as often as that créaturé 
throfts out its fhout: this is very much the café 
alfo in Snails. What atheift is there, who would 
not be confounded and {truck dumb, on examin- 
ing attentively the wonderful contrivance in thé 
vifcera of animals? For my part, I dare challengé 
mankind to defcribe properly the {malleft por- 
tion of the meaneft creature that crawls upon the 
éatth. Whcever fhould undértake fo bold a 
tafk, would lofe his eyes in the attempt. For, 
there is no doubt but any one, who, in this vale 
of tears and ignorance, fhould fully and imme- 
diately behold the divine fun of thefe truths, 
which God has treafured up in his creatures, 
would forfeit fight for his prefuimption. Such 
has been the unhappy, though deferved fate of 
all thofe; who have attempted to difprove and 
overturn by human reafonings, and fenfible ex- 
“periments, the divinity of the Creator, fo clearly 
fhining forth in the' whole nature of things. 
63 
Whatever is a fenfible obje&t, muft lie within the 
{phere of the fenfes; but our fenfes are coarfe; 
and cannot of themfelves teach us any truth, un- 
lefs prior ideas of it have been impreffed upoii- 
us by him, from whom we derive our exiftence. 
This, father Malabranche has moft inconteftably 
proved in bis inquiry after truth. 
_ The brain in the Mite conlifts of two glo- 
bular parts, which in a manner conftitutes its 
right and left portions, Tab: XLIT. Fig. vir 
aa. Near the brain is fituated the beginning 
of the fpinal marrow, which in this place is 
always opened, fo as to give a paflage to the 
gullet. From the fore region of the brain 
there iffue fome confiderable nerves, which 
dilate a little, at the diftance of half their 
length from their origin, 64. But this parti- 
cular is not obfervable in every Mite. Thefe 
nerves at leneth fwell into two diftin@ and 
very confpicuous nodules, c, from which arife 
two fimaller and very delicate nerves, dd. f 
could not trace thefe far enough to know what 
parts they run to: I believe it is to the mufcu- 
lar parts of the mouth, palate, and feet. Next 
under the brain, and from the beginning of 
the fpinal marrow, there arife two pair of very 
flender nerves, ee, which admirifter to the 
vifcera in the abdomen, and to the mufcles 
moving the rings of the body. Under thefe 
appear two confiderable nerves, which, after 
dilating into two oblong globes, ff, clofe again, 
and then form two other globes, fmallér than 
the former; from which there arife again two 
nerves: but what thefe nerves are, or what 
purpofes they ferve in this infect, I cannot tell. 
I believe, indeed, they exift ufelefsly in the 
Worm, and are to work the miufcles of the 
wings, when it becomes a Fly. From each 
fide of the fpinal marrow there iffue a great 
many other delicate and fmall nerves, £8 
which are all diftributed to the inner parts of 
the creature, and to the mufcles of its body ; 
and many of thefe nerves fubdivide into vari- 
ous rainifications, bbb. 
The fpinal marrow will appear very {hort, if 
we compare its length with that of the entire 
infect; and the fame may be faid of the body 
of the Fly into which the Mite turns. It is 
therefore neceffary, that the nerves, which are 
extended to fo great a length, fhould contrac 
themfelves, and become fhorter, at the time 
that the Worm begins to change to a Nymph. 
In animals, whofe blood is of a red colour, 
fuch as Dogs and Calves, I have often obferved, 
that the nerves fhrink up, as Serpents do, into 
tings, or like a fpiral, as often as the part to 
which they are fixed undergoes any contrac- 
tion: and this is chiefly obfervable in the nerves 
of the mefentery; whereas in the Worm now 
before us, the nerves are in every part equally 
contracted. ‘This likewife happens in the Cof- 
fus, or Worm of the Beetle, where this con- 
traction affords a very uncommon and very en- 
tertaining fight. 
The {pinal marrow of the Mite confitts of 
twelve divifions, or, as it were, nodular fec- 
tions. ‘Thefe, however, are fcarce difcernible, 
on 
